package com.example.utils;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.parser.ParserConfig;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.type.TypeFactory;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.SerializationException;

import java.nio.charset.Charset;

/**
 * @author: 21050134
 * @date: 2023/11/8 11:51
 * @description:
 */

/**
 * Redis使用FastJson序列化
 */
public class FastJsonRedisSerializer<T> implements RedisSerializer<T> {
	public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8");

	private Class<T> clazz;

	static
	{
		ParserConfig.getGlobalInstance().setAutoTypeSupport(true);
	}

	public FastJsonRedisSerializer(Class<T> clazz)
	{
		super();
		this.clazz = clazz;
	}

	@Override
	public byte[] serialize(T t) throws SerializationException
	{
		if (t == null)
		{
			return new byte[0];
		}
		return JSON.toJSONString(t, SerializerFeature.WriteClassName).getBytes(DEFAULT_CHARSET);
	}

	@Override
	public T deserialize(byte[] bytes) throws SerializationException
	{
		if (bytes == null || bytes.length <= 0)
		{
			return null;
		}
		String str = new String(bytes, DEFAULT_CHARSET);

		return JSON.parseObject(str, clazz);
	}

	protected JavaType getJavaType(Class<?> clazz)
	{
		return TypeFactory.defaultInstance().constructType(clazz);
	}


}
